Wash spinach thoroughly and cut into 2-3 pieces.

Slice onion and king oyster mushroom thinly.

Slice Vienna sausages and cherry tomatoes.

Heat olive oil in a pan and sauté onion, mushroom, and sausages over high heat.

Add spinach to the pan and season with salt and pepper. Cook until spinach is slightly wilted.

Beat eggs with 2 pinches of salt and mix in milk.

Grease an oven-safe dish with olive oil, spreading it evenly on the walls.

Spread sautéed vegetables evenly in the dish.

Pour egg mixture over the vegetables and top with sliced cherry tomatoes.